Split pulley.



rinrrnn sra'rins rafrnn'r orricn.

WILLIAM H. STOCIU-IAM, OF BIRMINGrI-IAM,l ALABAMA, ASSIGNOR TOSCI-IAEFER MANU- FACTURING COMPANY, OF BIRMINGHAM, ALABAMA, ACORPORATION OF ALABAMA.

SPLIT PULLEY.

To all 'whom t 'may concern:

Be it known that I, WILLLAM H. STOCK- HAM, a citizen of the UnitedStates, residing at Birmingham, in the county of Jefferson and State ofAlabama, have invented new and useful Improvements in Split Pulleys, ofwhich the following is a specification.

My invention relates to improvements in split pulleys which havedetachable and interchangeable bushings which are also split and havebores of different diameters.

One object of my invention is to provide an improved bushing which isgrooved or weakened along irregular lines so that, when split, theportions will securely interlock against lateral displacement. The lineof cleavage, as thus provided, may be V-shaped or consist of two linesof fracture which are offset or out of alinement with each other. Inboth constructions a small opening is provided at the middle of thecleavage line to receive the tool used to split the bushing.

A further object is -to provide the manner of securing the bushing inplace in the pulley hub, and in this connection, it will be evidentwhere the two sections of the bushing interlock with each other and areso held by the pulley hub, that it will be necessary to use only asingle set screw to hold both parts of the bushing in place. The bushingmay be turned with a plain circumference, and if the opening for the setscrew therein be made slightly smaller than the screw so that it willhave to force its way through, a decided improvement will be gained overconstructions wherein the opening through the bushing is large enough t0leave a clearance around the screw, which being thus left unsupportedbetween the reverse strains, tends to bend diagonally across t-heopening and then can not be removed with ease.

These and other improvements constituti ing my invention are hereinaftermore fully described and illustrated in the accompanying drawings, inwhich:-

Figure l is a side view of the assembled pulley after the hub rim andbushing have been broken and again joined together. Fig. 2 is a detailperspective view of one form of my improved split bushing, and Fig.

Specification of Letters Patent.

Application led May 7, 1908.

Patented Nov. 22, 1910.

Serial No. 431,505.

3 is a side view of the same bushing after fracture. Figs. l and 5 areviews corresponding to Figs. 2 and 3 of a modified form of bushing. Fig.6 is an enlarged detail end view of the pulley hub and bushing `brokenaway to show the contracted opening in the bushing for the set screw.Fig. 7 corresponds to Fig. 6, showing the usual set screw opening in thebushing and illustrating the disadvantages of that construction.

In the drawings, I provide a split pulley having a rim l, and a hub 2which is suitably weakened at 3 so that the hub which has been otherwisecast integral may be broken into along these weakened portions orcleavage lines. In the same transverse plane with the cleavage lines forthe hub, I provide a transverse weakened portion or cleavage line lextending across the rim and flanged on each side by a pair of inwardlyprojecting lugs 5 which are at their outer edges cast integral andadapted to be broken apart and then fastened together by bolts 6. Thehub is cast with bolting lugs 7 through which pass bolts 8 which connectthe halves of the pulley hub together after the same have been splitapart. The pulley may be split in any suitable manner as now inpractice.

To adapt pulleys of this type to fit shafts of varying diameters, eachpulley of a given size is provided with detachable and interchangeablebushings, as 9, which have the same diameter over all but varyinginternal diameters. The bushings are turned up slightly larger than thebore of the pulley hub but are reduced in circumference to properly fitsaid bore by filing down the edges along the line of fracture of thebushing when split as hereinafter described.

These bushings are turned up with a practical smooth exterior and haveno lugs or offsets which would increase their cost of manufacture. Nearthe middle of the bushing I bore or drill a small opening 10 to receivethe splitting tool, as it will be necessary to split these bushings toenable them to be assembled around the shaft. From the opening 10 I cutor otherwise provide grooves or weakened cleavage lines 1l which, forthe purpose of enabling the two bushing sections to interlock with eachother against lateral displacement when clamped around the shaft by thepulley hub, are arranged out of alinement.

In my preferred construction these linesare disposed at angles meetingat the opening l0, or an equally effective construction is secured asseen in Fig. 4, where the cleavage line leading from the rim of thepulley into theopening l0 is disposed parallel with but out of alinementwith the other cleavage line leading from the opening to the other rim.In this construction when the bushings have been split, each will beprovided with a shoulder on one side of the opening l() which is offsetfrom the other side. In my preferred construction the sections ofthebushing will have V-shaped fractures, but in both cases the sections ofthe bushing will effec-- tively interlock with each other after theyhave been filed down to the desired extent, and have been clamped inplace in the hub. To secure the bushing in place in the pulley hub, Iprovide a set screw l2 which passes through a threaded opening in one ofthe hub sections and is adapted to be forced through a smooth opening 13provided in one of the bushing sections. By making this opening ofslightly smaller diameter than the threads of the set screw, the latterwill have to force its way through to reach the shaft, and in doing thiswill become practically solid with the bushing. This construction I havefound to be greatly advantageous over constructions wherein a largeopening is left for the set screw, for in such constructions the screwis likely to act as may be seen in Fig. 7. On the other hand thethreading of the opening in the bushing would increase its costunnecessarily.

To effectively lock the sections of the bushing shown in Figs. 4 and 5against relative lateral displacement in either direction, I arrange thegrooves l1 on opposite sides of the bushing in such manner that areverse lock is provided on the rear side from the 4shoulder lockobtained on the front side.

This will be noted by the position of a dotted cleavage line in Fig. 5.

It is further to be noted that the provision of the opening and groovesin the bushing permits the oil of lubrication to flow through theopenings and collect in the grooves so that the latter acts as storagechambers for excess oil which will flow back when a deiciency of oiloccurs in the ordinary manner of lubricating the journal.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is

l. A bushing for split pulleys comprising an integral tubiform bodyportion having weakening grooves formed in the outside of the body andrunning substantially longitudinal of said body, each groove consistingof disalined adjoining portions, said bushing further having an openingleading from the juncture of the disalined portions of each groove tothe interior.

2. A bushing for split pulleys comprising an integral tubiform bodyportion having weakening grooves formed on V-shaped lines along theexterior of said body and running substantially longitudinal of saidbody, said bushing further having openings leading from the apices ofthe V-shaped groove lines to the interior.

3. The combination with a split pulley having a cylindrical bored hub,and means to unite the pulley sections, of a bushing for said pulleycomprising' an integral tubiform body portion having weakening groovesformed on the outside of the body and running substantially longitudinalof said body, each groove consisting of -disalined adjoining portions,said bushing further having an opening leading' from the juncture of thedisalined portions of each groove to the interior.

4L. The combination with a split pulley i having a cylindrical boredhub, and means to unite the pulley` sections, of a bushing for saidpulley comprising' an integral tubiform body portion havinglongitudinally arranged weakening grooves formed on V- shaped linesalong the exterior of said body, said bushing further having openingsleading from the apices of the V-shaped grooves to the interior.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witi nesses.

1WILLIAM H. STOCKI-IAM.

lVitnesses A. R. Fonsr'rrr, Nonni VnLsH.

